APA (7th ed.) Citation

(1994). Collins Gem dictionary of English spelling (Repr.). HarperCollins.

Chicago Style (17th ed.) Citation

Collins Gem Dictionary of English Spelling. Repr. Glasgow: HarperCollins, 1994.

MLA (9th ed.) Citation

Collins Gem Dictionary of English Spelling. Repr. HarperCollins, 1994.

Warning: These citations may not always be 100% accurate.